Hello, I’m encountering a consistent blocking issue with the Codex client that makes it impossible to continue working after some time. :red_circle: Problem description At a certain point (likely when the context becomes large), Codex attempts to run a context compaction task and fails with the fo…

I’m seeing a new bug today that is occurring frequently when the application does auto compaction. [image]

Version 26.409.20454 (1462) 26.4.1 (25E253)

Same thing, bro) I think this is a system problem

I’ve just started experiencing the same error.

Same problem today, subscribing

Codex client crash: "Unknown parameter: prompt_cache_retention" during context compaction (blocking issue)

nickzsb.nz April 14, 2026, 6:03pm 3

Topic		Replies	Views
Custom harness getting random prompt_cache_retention errors Codex CLI bug	2	308	August 19, 2026
Codex remote compaction fails with 502 "response protection is unavailable" Bugs codex	0	244	October 9, 2026
Premature auto-compaction in Codex Bugs codex-cli , compaction	0	105	October 20, 2026
Codex Desktop auto-compaction sends unsupported `context_compaction` item type Codex codex-desktop-app	1	371	September 17, 2026
Codex reports "Codex ran out of room in the model's context window. Start a new thread or clear earlier history before retrying." Codex bug , codex-app	1	1348	September 17, 2026